config.reload_plugins = true only works in environment.rb

The seemingly obvious place to add config.reload_plugins = true is in development.rb, however this doesn't work because add_plugin_load_paths is called before load_environment. I'm not sure whether this is a documentation issue or whether to come up with a patch.

Setting it in environment.rb shouldn't have any detrimental effect in production (I think), so a documentation update would be the easiest fix. However, if a patch is preferred maybe it'd be better to add a new process step rather than moving add_plugin_load_paths to after load_environment as changing the order of the process steps always seems to break something.